Archive for May, 2014

A BACKDOOR COLD FRONT BRINGS COOLER WEATHER AND SOME FOG TO PARTS OF THE AREA WEDNESDAY MORNING… THE RAIN HAS BEEN DELAYED UNTIL FRIDAY, WHEN WE MAY SEE SOME HEAVY DOWNPOURS

The frontal system that was initially supposed to bring showers as early as today (Wednesday) has been continually slowing down as it makes its way eastward across the central states. Now, meteorologists are predicting that we won’t see rain until Thursday night and more likely on Friday. As deep moisture gets pulled northward from the Gulf of Mexico and Atlantic Ocean, some heavy rain may occur. The trough associated with the cold front is expected to become negatively tilted, which means that the trough axis will run northwest to southeast. This is significant since it results in the front moving very slowly and it usually results in very heavy rainfall for some locations… As far as our weather today is concerned, a backdoor cold front has brought down a marine air mass, which means that it will be cooler in Hampton Roads due to the onshore flow. (See my Weather Fact on Backdoor Cold Fronts). Areas inland should be warmer today. Fog has also been an issue this morning in some spots. There is a slight chance of a shower or storm today and tomorrow, but rain chances go up significantly Thursday night and Friday as the aforementioned cold front slowly approaches from the west. Please monitor the local media and National Weather Service for the latest updates as localized flooding may be possible. Severe weather may also be possible. Winds are also expected to increase on Friday. As it looks right now, the weekend looks good but if the system slows even more, Saturday’s forecast could change. Much cooler air is going to move into our region behind the frontal system this weekend, so our air conditioners will get a break. That’s it for now. Have great day!

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THE WEATHER ON MOTHER’S DAY WILL BE NICE… MORE HEAT AND HUMIDITY ARE IN STORE FOR MONDAY AND TUESDAY AS HIGH PRESSURE SETS UP OFF THE COAST… RAIN CHANCES INCREASE BY MID-WEEK

First of all, Happy Mother’s Day to all the moms out there! … On Saturday, some parts of Southeast Virginia and Northeast North Carolina had some showers and storms late in the day and at night. My neighborhood only had a very brief shower. The reason for the showers/storms was a cold front and shortwave energy that passed through the region. High pressure will build in today making for a very nice day with plenty of sunshine. The high will move off the coast and become like a Bermuda High. (Go to my Weather Facts and read the fact entitled “What is the Bermuda High?”).  This will result in a warm south to southwesterly flow. (Winds blow clockwise around high pressure systems in the northern hemisphere). Eventually, a trough of low pressure in the upper-atmosphere will move slowly eastward along with a cold front. This will increase the chance for showers and storms beginning on Wednesday and the unsettled weather pattern should last until Friday. I checked the potential for precipitation over the next week or so and just like this system that moved through yesterday, the heaviest rain potential looks like it will be to our north and west again. That could change but for now, that’s the way it looks. Stay tuned as there could be some tropical moisture that gets entrained into the system, which would result in very heavy rain in some parts of the Northeastern and Mid-Atlantic States later in the week. So, in summary, we get a break from the heat and humidity today but temperatures heat up tomorrow and Tuesday. That’s it for now. Have a great day!

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TEMPERATURES ARE EXPECTED TO BE ABOVE NORMAL ON THURSDAY… THE FORECAST FOR THE WEEKEND IS A BIT UNCERTAIN, ESPECIALLY SUNDAY, MOTHER’S DAY… NEXT WEEK MAY BE UNSETTLED WITH RAIN CHANCES INCREASING

There has been a stationary front to our southwest for the past couple of days. This front separates much warmer air from the cool air mass that has been over our region keeping our temperatures below normal for most of Hampton Roads. (The normal high temperature is 73 degrees).  This is the same frontal boundary that helped trigger the thunderstorms Monday night that contained hail. Things are about to change as forecasters are predicting the front to start moving northeastward as a warm front. Temperatures on Thursday are expected to be well above normal possibly approaching the 90 degree mark well inland. On Friday and Saturday, the temperature forecast gets a bit tricky as a lot will depend on the wind direction and cloud cover. Keep in mind that the ocean and bay temperature is still rather cool so if the wind blows from the water, temperatures can be much cooler. (See my Weather Facts on Sea Breezes and Back Door Cold Fronts). Once we get to Mother’s Day, the forecast is even more uncertain as forecasters aren’t sure right now whether there will be showers and thunderstorms from a system to our west that will be slowly approaching our region. Next week might be on the wet side as long range computer models are indicating that we may have several days of showers and thunderstorms. That’s it for now. Have a great day!

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A COLD FRONT DROPS TEMPERATURES ACROSS THE AREA… CLOUDS WILL INCREASE LATER MONDAY… RAIN/SHOWERS ARE POSSIBLE MONDAY NIGHT AND EARLY TUESDAY… WARM WEATHER SHOULD RETURN LATER IN THE WEEK

After a spectacular weekend, a cold front has dropped temperatures across the area and the front is expected to stall over southern N.C. Clouds are expected to increase today as moisture overruns the cooler air at the surface. A weak low pressure system may also develop along the front which could enhance the chance of showers Monday night and early Tuesday. The front is expected to return as a warm front. Later in the week, temperatures should return to above normal readings. Another cold front is expected to approach later in the week possibly bringing another chance of showers…. Note that the Climate Prediction Center is forecasting above normal rainfall for our part of the country next week (May 10-14).  That’s it for now. Have a great day!

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THE WEEKEND WEATHER SHOULD BE NICE OVERALL… SUNDAY SHOULD BE A WARMER DAY

The large low pressure system that caused so much misery this past week is finally gone. As expected, rainfall totals were higher to our west, and there has been some residual river flooding near the Blackwater River as a result of the heavy rainfall. River levels are expected to subside slowly today. The flooding in Pensacola, Florida was quite remarkable. Just imagine what 20 inches of rain is like in a 24 hour period. Reports of 6 inches of rain in one hour were received from the area. And, of course, the tornadoes were quite remarkable both in number and severity. Weather is blamed for that street collapse in Baltimore that damaged several vehicles and there was flooding in parts of the Northeast and Northern Mid-Atlantic States. The low pressure system pulled in copious amounts of Gulf moisture and disturbances in the upper atmosphere spiraling around the low resulted in the severe weather and heavy rainfall… Our weekend weather here in Hampton Roads looks quite nice. There is a weak system causing some light showers/sprinkles in some spots early this morning, but conditions should improve by mid day. On Sunday, temperatures will warm by several degrees as a southwest wind develops out ahead of an approaching cold front. That cold front coming down from the north is expected to stall to our south on Monday, which may bring a chance of some showers Monday night and Tuesday. The weather pattern next week looks to be more progressive so we should see some day to day changes in the weather with just a chance of a shower or storm every now and then. It appears that we should see seasonal temperatures with a slow warming trend by the end of next week.

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